Datasheet LM25149-Q1 (Texas Instruments) - 2

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LM25149-Q1
SNVSBV6 – DECEMBER 2020
www.ti.com Table of Contents 1 Features
..1 8.4 Device Functional Modes..22
2 Applications
... 1
9 Application and Implementation
.. 23
3 Description
...1 9.1 Application Information... 23
4 Revision History
.. 2 9.2 Typical Application.. 29
5 Description (continued)
.. 2
10 Power Supply Recommendations
..38
6 Pin Configuration and Functions
...3
11 Layout
... 39 6.1 Wettable Flanks.. 4 11.1 Layout Guidelines... 39
7 Specifications
.. 5 11.2 Layout Example.. 43 7.1 Absolute Maximum Ratings ... 5
12 Device and Documentation Support
..45 7.2 ESD Ratings ... 5 12.1 Device Support... 45 7.3 Recommended Operating Conditions ..5 12.2 Documentation Support.. 46 7.4 Thermal Information ...6 12.3 Receiving Notification of Documentation Updates..47
AD
7.5 Electrical Characteristics ..6 12.4 Support Resources... 47 7.6 Active EMI Filter ...9 12.5 Trademarks...47
8 Detailed Description
..10 12.6 Electrostatic Discharge Caution..47
V
8.1 Overview... 10 12.7 Glossary..47
A
8.2 Functional Block Diagram... 11
13 Mechanical, Packaging, and Orderable NCE INFO
8.3 Feature Description...12
Information
.. 47
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE REVISION NOTES R
December 2020 * Initial release
MA TION 5 Description (continued)
Additional features of the LM25149-Q1 include 150°C maximum junction temperature operation, user-selectable diode emulation for lower current consumption at light-load conditions, open-drain Power-Good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 2.8-ms soft-start time, and thermal shutdown protection with automatic recovery. The LM25149-Q1 controller comes in a 3.5-mm × 5.5-mm thermally-enhanced, 24-pin VQFN package with wettable flank pins to facilitate optical inspection during manufacturing. 2 Submit Document Feedback Copyright © 2020 Texas Instruments Incorporated Product Folder Links: LM25149-Q1 Document Outline 1 Features 2 Applications 3 Description Table of Contents 4 Revision History 5 Description (continued) 6 Pin Configuration and Functions 6.1 Wettable Flanks 7 Specifications 7.1 Absolute Maximum Ratings 7.2 ESD Ratings  7.3 Recommended Operating Conditions 7.4 Thermal Information 7.5 Electrical Characteristics 7.6 Active EMI Filter 8 Detailed Description 8.1 Overview 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Input Voltage Range (VIN) 8.3.2 High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA) 8.3.3 Enable (EN) 8.3.4 Power Good Monitor (PG) 8.3.5 Switching Frequency (RT) 8.3.6 Active EMI Filter 8.3.7 Dual Random Spread Spectrum (DRSS) 8.3.8 Soft-Start 8.3.9 Output Voltage Setpoint (FB) 8.3.10 Minimum Controllable On-Time 8.3.11 Error Amplifier and PWM Comparator (FB, EXTCOMP) 8.3.12 Slope Compensation 8.3.13 Inductor Current Sense (ISNS+, VOUT) 8.3.13.1 Shunt Current Sensing 8.3.13.2 Inductor DCR Current Sensing 8.3.14 Hiccup Mode Current Limiting 8.3.15 High-Side and Low-Side Gate Drivers (HO, LO) 8.3.16 Output Configurations (CNFG) 8.3.17 Single-Output Two-phase Operation 8.4 Device Functional Modes 8.4.1 Standby Modes 8.4.2 Pulse Frequency Modulation and Synchronization (PFM/SYNC) 8.4.3 Thermal Shutdown 9 Application and Implementation 9.1 Application Information 9.1.1 Power Train Components 9.1.1.1 Buck Inductor 9.1.1.2 Output Capacitors 9.1.1.3 Input Capacitors 9.1.1.4 Power MOSFETs 9.1.1.5 EMI Filter 9.1.2 Error Amplifier and Compensation 9.2 Typical Application 9.2.1 Design Requirements 9.2.2 Detailed Design Procedure 9.2.2.1 Custom Design With WEBENCH® Tools 9.2.2.2 Custom Design With Excel Quickstart Tool 9.2.2.3 Buck Inductor 9.2.2.4 Current-Sense Resistance 9.2.2.5 Output Capacitors 9.2.2.6 Input Capacitors 9.2.2.7 Frequency Set Resistor 9.2.2.8 Feedback Resistors 9.2.2.9 Compensation Components 9.2.2.10 Active EMI Components 9.2.3 Application Curves 10 Power Supply Recommendations 11 Layout 11.1 Layout Guidelines 11.1.1 Power Stage Layout 11.1.2 Gate-Drive Layout 11.1.3 PWM Controller Layout 11.1.4 Active EMI Layout 11.1.5 Thermal Design and Layout 11.1.6 Ground Plane Design 11.2 Layout Example 12 Device and Documentation Support 12.1 Device Support 12.1.1 Development Support 12.1.2 Custom Design With WEBENCH® Tools 12.2 Documentation Support 12.2.1 Related Documentation 12.2.1.1 PCB Layout Resources 12.2.1.2 Thermal Design Resources 12.3 Receiving Notification of Documentation Updates 12.4 Support Resources 12.5 Trademarks 12.6 Electrostatic Discharge Caution 12.7 Glossary 13 Mechanical, Packaging, and Orderable Information